Ashley Tisdale from High School Musical had a nosejob recently (it's been all over the news), and she revealed the reason why. She's had something wrong with part of her nose and it interfered with her breathing and actually made breathing painful; that's why she eventually went ahead and got the surgery done.

I know a guy who is having that surgery done aswell. He was at the point where he had to sleep with an onxygen mask on because when he was lying down he couldnt get any sir through his nose at all.